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Just completed a 2,000 Nm trip from Malaysia to East Java and had a barely noticeable RPM surge on the starboard engine 3 times over 10 hours.
RPMs were app. 1200 with EGT around 600 F and everything else seemed okay on instruments, there was an audible rpm increase for a second or so which I did not see on the SMX digital displays, this also occurred the previous day except I only noticed it twice over 10 hours. Gauges on fuel filters were in the green, fuel lines are 1/2″ and fuel was the same batch used over the previous week. Engine controls are Glendinning on their own N2K network which have worked flawlessly for the entire trip.
This may have occurred previously without being noticed while running on both engines however the Port engine had sheared its shaft at the coupling a few days prior and was not running while the boat limped into a place that could haul it out.
Could the surge be indicative of a governor/fuel pump issue that should be attended to while the boat is hauled out for repairs or any other ideas?
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